Intro: 

Socket Weld Flanges are similar to slip-on flanges, however, socket welds have an internal recess on the inside diameter to allow for a smoother flow of the process fluid. The positive of this is that is creates a smooth bore with the proper welding and grinding. The negative of this type of flange is that it can be more expensive than a slip-on due to more intricate machining, and they can be less readily available than slip-ons due to the fact that the bottom half of the inside diameter must be made to the same schedule as the pipe that is being used. (you must specify the schedule needed) These socket weld flanges were initially developed for use on smaller sizes of pipe at higher pressure ratings. They are more used on lower pressure temperature as well today.

Flange Type: Slip-On flanges, Welding Neck flanges, Blind flanges, Socket Welding flanges, Threaded flanges, Lap Joint flanges and Plate flanges etc.
Pressure Ratings: Class 150, 300, 600, 900, 1500 and 2500
Pressure Ratings: PN 6, PN 10, PN16, PN25, PN40 and PN64
Pressure Ratings: JIS 5K, 10K, 16K and 20K
Materials:Carbon steel, Stainless steel and Alloy steel etc.
Standards:ANSI, API, BS, DIN, UNI, JIS and MSS SP etc.
Size:1/2" ~ 64"(DN15 mm ~ 1600 mm)